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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25d886962f3709ebed28a845c671acea2ea0aa13507fc5bbf7d72f23180b3798' 
  AND token = 'aKiBw1MAZUd7SQQKhtvtaun2Ry0qlK0wE4JaS8c3e4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}